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Chapter 11

Chapter 11. CMOS and TTL Circuits By Taweesak Reungpeerakul. Contents. Basic Operational Characteristics and Parameters CMOS Circuits TTL Circuits. 11.1 Basic Operational Characteristics and Parameters. DC Supply Voltage CMOS: +5 or +3.3 Volts TTL : +5 Volts CMOS Logic Levels

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Chapter 11

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  1. Chapter 11 CMOS and TTL Circuits By Taweesak Reungpeerakul 241-208 CH11

  2. Contents • Basic Operational Characteristics and Parameters • CMOS Circuits • TTL Circuits 241-208 CH11

  3. 11.1 Basic Operational Characteristics and Parameters • DC Supply Voltage • CMOS: +5 or +3.3 Volts • TTL : +5 Volts • CMOS Logic Levels • +5 V Supply VIH : 3.5-5 V VOH : 4.4-5 V VIL: 0-1.5 V VOL: 0-0.33 V • +3.3 V Supply VIH : 2-3.3 V VOH : 2.4-3.3 V VIL: 0-0.8 V VOL: 0-0.4 V • TTL Logic Levels (+5 V Supply) VIH : 2-5 V VOH : 2.4-5 V VIL: 0-0.8 V VOL: 0-0.4 V 241-208 CH11

  4. 11.1 Basic Operational Characteristics and Parameters (cont.) • Noise Immunity • Noise Margin • Power Dissipation • Propagation Delay (tPHL & tPLH) • Speed-Power Product • Loading and Fan-out 241-208 CH11

  5. Noise Immunity 241-208 CH11

  6. Noise Margin • VNH =VOH(min)– VIH(min) • VNL =VIL(max)– VOL(max) • Find VNH &VNL for 5 V CMOS • VNH =VOH(min)– VIH(min) =4.4– 3.5 =0.9 V • VNL =VIL(max)– VOL(max) =1.5– 0.33 =1.17 V Question: Find VNH &VNL for 5 V TTL 241-208 CH11

  7. ICC = ICCH+ICCL 2 PD = VCC*ICC Example: find PD 2 µA when HI 3.6 µA when LO 50% Duty cycle Power VS Frequency Power Dissipation • ICC= 2.8 µA • PD = (5V)(2.8µA) = 14 µW 241-208 CH11

  8. Loading and Fan-out • Fan-out 241-208 CH11

  9. CMOS Loading 241-208 CH11

  10. TTL Loading 241-208 CH11

  11. 11.2 CMOS Circuits • MOSFET n-channel p-channel 241-208 CH11

  12. CMOS Inverter 241-208 CH11

  13. CMOS NAND Gate 241-208 CH11

  14. CMOS NOR Gate 241-208 CH11

  15. Open-drain Gate 241-208 CH11

  16. Tristate CMOS Gate 241-208 CH11

  17. 11.3 TTL Circuits • The Bipolar Junction Transistor(BJT) • TTL Inverter • TTL NAND Gate • Open-collector Gates • TristateTTL Gates 241-208 CH11

  18. The Bipolar Junction Transistor(BJT) 241-208 CH11

  19. TTL Inverter 241-208 CH11

  20. TTL NAND Gate 241-208 CH11

  21. Open-collector Gates 241-208 CH11

  22. Tristate TTL Gate 241-208 CH11

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